Improvement in sewing-machines



2 Sheets-Sheebl A. H. WAGNER.

vSE'WINCr-MACIIINE. y "P atented May 2,1876.

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A. H. WAGNER.

SEWING-MACHINE.

` N.177,037- Patented May 2,1876.

UNITED STATES PATENT A AUSBERT H. WAGNER, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN SEWING-liflACl-IINES.-v

Specification forming part of Letters Patent No. 177,037, dated May 2,1876; application filed February 16, 1876. v

. To all whom iiimay concern:

Be it known that I, AUsBERT H. WAGNER, of Chicago, in the county ofCook, and in the State of Illinois, have invented certain new and usefulImprovements in Sewing-Machines; and do hereby declare that thefollowing is a full, clear, and exact description thereof, refercncebeing had to the accompanying drawings, making a part of thisspecification, in whiehp Figure 1 is a plan 'view of the lower side ofmy improved machine, with theoperativeparts in position to move. theneedle to its lowest point. Fig. 2 is a like view of the same, show. ingsaid parts in position to raise said needle toits highest point. Figs. 3and 4 are side elevations of said machine, showing the relativepositions of said operative parts as arranged in Figs. 1 and 2,respectively; and Fig. 5 is a cross-section of the lower end -of thevibrating arm and the sliding block employedV for connecting the samewith-the crank-arm for operating said arm.

Letters of like name and kind refer to like parts in each of thefigures.

The design of my invention is to simplify the mechanism employed for imparting the necessary variable motion to the vibrating arm of a sewingmachine, and also to reduce the backlash to a minimum 5 to which end itconsists in combining, with the lower end of the vibrating arm of asewing-machine, a sliding block, which worksl within a longitudinalgroove provided in said arm, a crank-arm that is pivotedor journaled atone end to or upon the base-plate, that occupies a positionsubstantially at a right angle to the line of the end of said vibratingarm,and has its lower or free end connected with said sliding block, andwith suitable mechanism for giving to it a reciprocating motion,substantially as and for the purpose hereinafter specified.

In the annexed drawings, A represents the hase-plate, B the fixed arm, Cthe housing or n head, D the needle-bar, and E the vibrating arm, of asewing-machine, all constructed, in the usual manner, above saidbase-plate. Jonrnaled upon the lower side ot' the bascplate A, midwaybetween the pivotal bearing e and the forward end of the vibrating armE, is a crank-arm,'F, which is arranged to oscillate in a vertical planehaving the same line as said vibratingarm., and at its lower end isconnected to or with a crank, G, upon one end of the driving-shaft H bymeans of a bar or rod, I, that at its ends is pivoted or journaled uponsaid parts, the arrangement of said parts being such as to cause saidcrankarm F to have an oscillating movement as said shaft revolves. Thelower end of the vibrating arm D extends forward and downward, asseen'in Figs. 3 and 4, andis provided with a cylindrical opening, E',which extends longitudinally inward from its end. Upon the side adjacentto the crank-arm F the wall ofthe cylindrical opening E is removed, soas to form a slot, e', and within said opening is loosely fitted acorrespondingly-shaped block, K, which at its longitudinal center isprovided with a cylindrical recess, It, that receives and is caused toreciprocate by thev rotation of thedrivin g-shaft.

The operation of the mechanism described is as follows: When the crank Goccupies the position shown by the full lines of Fig. 3, the crank-,armF has substantially a right angle to the cylindrical opening E of thevibrating arm E, and the needle-bar` D is at its lowest point. As thesaid crank G continues its motion, said crank-arm F is moved upward andrearward, and carries the engaging end of said vibrating` arm upward, soas to slightly raise said needle har and the needle, and slacken thethread which the latter has carried through the cloth, the relativepositions of said parts being shown by the dotted lines of Figs. l and3. Upon continuing the motion ofthe crank G, the needle-bar D againdescends, and reaches its lowest point as said crank attains theposition shown by the full lines of Figs. 2 and 4, after which thefurther rotation of said crank to the position shown by the dotted linesof said figures causes said needle-bar to rise to its highest point andthe needle to be withdrawn from the cloth. It

ramen.

2 unos-r will be seen that at the time when the `needle is entering thecloth, and thengreatest strain is thrown upon the operative mechanism,the

crank G has a right angle to the line of the i bar I, and exercises itsgreatest power While the sliding block K `is near the, lower` end `ofthevibrafing arm, so that the crank-arm F exercises its greatestforceupon said arm, the

1 power being thus caused to correspond `tothe requirements ofthemachine.

In consequence of the means employed forj' operating the vibrating`arm,` the only hack lash possible is such as may be due to theplay inthe sliding block and in the journal 'of the crank-arm, and no amount ofwear in the cennecting-bar or in the drivin g-shaftcan increase thebaekash of said vibrating arm. i

` The cylindrical form of thesliding block and itsi opening insures thegreatest amount of bearing-surface with 'the least quantity ot February,1876.

metal. It enables said block to adjust itself periplierally in case thecrank-pin f is4 not cxi actly in a line at a right angle to the plano ofmotion of the crank-arm. It prevents lateral movement of said block'withinits. openi ing, and it renders necessary but little weight ofmetal in the lower portion of the vibrating arm. y

It'desired; the cylindrical openii-ig may omitted, and a` square openingand a `correspondiuglyshaped block substituted therefor. Having thusfully set forth the nature and merits of my invention, what I claim asnew In a sewiugr-machine,` the combination of a sliding block, whichworks longitudinally' within a coi-'responding groove in the lower endofthe vibrating arm, a crank-arm that is Apivoted or journaled at oneend to or upon Aythe.baseplate, that occupies a position substantiallyat aright angle to the line'of said vibrating arm, and has its lower endcon neeted 1 with said sliding block, and suitable mechan- ;ism forgiving to Said crank-arma reciprocating motion,.substantially as and forthe purpose specified. y p

o In testimony that I claim the foregoing I have hereunto set my handthisl'th day y of AUSBERT H. WAGNER.`

Witnesses: f

GEO. S. PRINDLE, WILLIAM Frcrcn.

